CN205609344U - Hierarchical formula current -voltage combined mutual inductor of gas -insulated - Google Patents

Abstract

The utility model relates to a hierarchical formula current -voltage combined mutual inductor of gas -insulated, including a voltage -sharing shielding section of thick bamboo, the inboard coaxial line of a voltage -sharing shielding section of thick bamboo is provided with interior insulating medium layer and outer insulating medium layer, the surface subsides on outer insulating medium layer are equipped with the first metal layer, the internal surface subsides on outer insulating medium layer are equipped with the second metal level, the surface subsides on interior insulating medium layer are equipped with and lie in the inboard third metal layer of second metal level, the internal surface subsides on interior insulating medium layer are equipped with third metal layer, the second metal level includes at least one outside low -voltage electrode, third metal layer includes the inboard low -voltage electrode with outside low -voltage electrode number one -to -one, inboard low -voltage electrode with correspond outside the low -voltage electrode short circuit. The utility model provides an among the prior art metal level, insulating medium layer, metal level, insulating medium layer, this kind of problem that sets up the structure in succession and have relatively high expectations to processing technology of metal level.

Description

A kind of gas-insulated stagewise current/voltage combination transformer

Technical field

This utility model relates to a kind of gas-insulated stagewise current/voltage combination transformer.

Background technology

Along with power system develops to Large Copacity, supertension and extra-high voltage direction, the requirement to power equipment miniaturization, intellectuality and high reliability is more and more higher.Common stagewise voltage transformer has closed assembly condenser type, coaxial capacitance formula voltage transformer, and wherein coaxial stagewise voltage transformer uses sulfur hexafluoride as internal major insulation medium, has insulating reliability high, the advantage of stable accuracy.

Existing gas-insulated stagewise voltage transformer such as Chinese patent CN103760396A disclosed " a kind of gas-insulated multi output electronic type pillar voltage transformer ", including all pressing shielding cylinder, all it is disposed with floating potential cylinder, the first metal layer, outside insulating medium layer, the second metal level, inner side insulating medium layer and the 3rd metal level from outside to inside inside pressure shielding cylinder, 3rd metal level ground connection, second metal level includes the low-field electrode of two and all tile like structure that pressure shielding cylinder is coaxially set, and low-field electrode is along the circumferentially-spaced layout of inner side insulating medium layer.This voltage transformer is stagewise capacitance partial pressure structure, during use, Primary Conductor is connected with all pressing shielding cylinder, all form high-voltage capacitance between pressure shielding cylinder and floating potential cylinder, between the first metal layer, the second metal level and the second metal level and the 3rd metal level, form low-voltage capacitance.Low-voltage capacitance side upper resistance introduce harvester, integrated, amplify, after double A/D conversion, be converted into optical signal after intelligent acess combining unit synchronization process to measuring on protection equipment by photoelectric conversion device.The existence of existing this stagewise voltage transformer is haveing a problem in that: the surfaces externally and internally at an insulating medium layer arranges the technique of metal level and is easier to realize, but metal level, insulating medium layer, metal level, insulating medium layer, metal level be this, and to be close to arrange technique continuously relatively difficult to achieve, processing technique requires height, being not easily accomplished, cost is of a relatively high.

Summary of the invention

The purpose of this utility model is to provide a kind of gas-insulated stagewise current/voltage combination transformer, and to solve metal level in prior art, insulating medium layer, metal level, insulating medium layer, this structure that arranges continuously of metal level require higher problem to processing technique.

For achieving the above object, scheme of the present utility model is:

A kind of gas-insulated stagewise current/voltage combination transformer, including upper end cylinder and all pressures shielding cylinder of being connected with upper end cylinder, upper end cylinder is provided with current transformer, the inner coaxial line all pressing shielding cylinder is provided with interior insulating medium layer and external insulation dielectric layer, the outer surface of external insulation dielectric layer has been sticked the first metal layer, the inner surface of external insulation dielectric layer has been sticked the second metal level, the outer surface of interior insulating medium layer is sticked the 3rd metal level being positioned at inside the second metal level, the inner surface of interior insulating medium layer has been sticked the 4th metal level, second metal level includes at least one outside low pressure electrode, 3rd metal level includes and outside low pressure number of poles inner side low-field electrode one to one, inner side low-field electrode and corresponding outside low pressure electrode short circuit.

Gap between second metal level and the 3rd metal level is filled with insulating gas.

The outside of the first metal layer has been coaxially set floating potential cylinder, all has the gap filled for insulating gas between pressure shielding cylinder and floating potential cylinder.

Outside low pressure electrode has at least two, outside low pressure electrode is the tile structure being coaxially set with external insulation dielectric layer, inner side low-field electrode is the tile structure being coaxially set with interior insulating medium layer, each outside low pressure electrode being provided at circumferentially spaced along external insulation dielectric layer, the gap between adjacent inboard low-field electrode is the most corresponding along the gap between the radial direction and corresponding adjacent outer low-field electrode of interior insulating medium layer.

The beneficial effects of the utility model are: the second metal level in the present invention, the first metal layer is attached at the interior of external insulation dielectric layer respectively, on outer surface, 4th metal level, 3rd metal level is attached at the interior of interior insulating medium layer respectively, on outer surface, second metal level and the 3rd metal interlevel are every setting, make the first metal layer, external insulation dielectric layer and the second metal level constitute a unit, 3rd metal level, interior insulating medium layer and the 4th metal level also constitute a unit, each unit is all easy to processing, simplify product processing technique, reduce the cost of manufacture of product.

Accompanying drawing explanation

Fig. 1 is the structural representation of an embodiment of the present utility model；

Fig. 2 is Fig. 1 China and foreign countries' insulating medium layer and the cooperation schematic diagram of first, second metal level；

Fig. 3 is interior insulating medium layer and the cooperation schematic diagram of the three, the 4th metal levels in Fig. 1；

Fig. 4 is electrical schematic diagram of the present utility model.

Detailed description of the invention

The embodiment of a kind of gas-insulated stagewise current/voltage combination transformer is as shown in figures 1-4: include upper end cylinder and all pressures shielding cylinder 3 being connected with upper end cylinder, upper end cylinder is provided with current transformer, during use, upper end cylinder 1 is connected with Primary Conductor, all inner coaxial lines of pressure shielding cylinder 3 are provided with interior insulating medium layer 19 and external insulation dielectric layer 12, the outer surface of external insulation dielectric layer 12 has been sticked the first metal layer 11, the inner surface of external insulation dielectric layer has been sticked the second metal level, the outside of the first metal layer is provided with floating potential cylinder 9, floating potential cylinder provides mechanical support for each metal level, the first metal layer is conductively connected with floating potential cylinder, all there is between pressure shielding cylinder 3 and floating potential cylinder 9 gap filled for insulating gas.The outer surface of interior insulating medium layer 19 is sticked the 3rd metal level being located at interval at inside the second metal level, is filled with insulating gas in the gap between the second metal level and the 3rd metal level, and the inner side of interior insulating medium layer has been sticked the 4th metal level 14.nullIn the present embodiment，Second metal level includes two outside low pressure electrodes，Two outside low pressure electrodes are respectively the first outside low pressure electrode 10 and the second outside low pressure electrode 13，3rd metal level includes the inner side low-field electrode arranged with outside low pressure electrode one_to_one corresponding，Two inner side low-field electrodes are respectively inside first low-field electrode 17 inside low-field electrode 15 and second，Each inner side low-field electrode respectively with corresponding outside low pressure electrode short circuit，Low-field electrode and the first outside low pressure electrode short circuit inside first in the present embodiment，Low-field electrode and the second outside low pressure electrode short circuit inside second，Outside low pressure electrode is the tile structure being coaxially set with external insulation dielectric layer，Inner side low-field electrode is positioned at the tile structure that insulating medium layer is coaxially set，Gap 18 between adjacent inboard low-field electrode is the most corresponding along the gap 20 between the radial direction and corresponding adjacent outer low-field electrode of interior insulating medium layer.

All form high-voltage capacitance C1 between pressure shielding cylinder and floating potential cylinder, low-voltage capacitance C2, C3 is formed respectively between the first metal layer with corresponding outside low pressure electrode, C2, C3 constitute the first potentiometer 7,4th metal level forms low-voltage capacitance C4, C5 between low-field electrode inside corresponding respectively, and C4, C5 constitute the second potentiometer 8., processing technique is consistent on capacitance structures at different levels independently, and during use, C4 and C5 draws output signal, simultaneously parallel resistance R1, and C4, C5 draw holding wire respectively, forms Sensing interface, connects collecting unit by holding wire.Signal lead-out wire uses high-weatherability shielding properties cable to conduct secondary voltage signal to harvester, and harvester is placed in totally-enclosed metal case body.Build-out resistor constitutes high pressure suppression circuit with secondary output capacitance, in voltage collector input parallel resistance, it is ensured that voltage signal change of disease precision.

It is distributed based on coaxial configuration, coaxial capacitance computing formula:

$C=\frac{2{\mathrm{\π\ϵ}}_o{\mathrm{\ϵ}}_{r}l}{\ln \frac{b}{a}}$

In formula: ε₀The dielectric constant of relative vacuum；ε_rDielectric constant；L capacitance plate length；A relatively low pressure side metal level radius；B relatively high pressure side metal level radius.

According to above-mentioned formula, calculate the capacitance of C1, C2, C3, C4 and C5, wherein C2=C3；C4=C5；Capacitance partial pressure ratio can be obtained as follows by Fig. 3 circuit theory:

$\frac{U_{01}}{U_i}=\frac{{\mathrm{jwC}}_x\·R_1\·{\mathrm{jwC}}_1\·R_1}{{\mathrm{jwC}}_1+R_1+{\mathrm{jwC}}_x\·R_1\·{\mathrm{jwC}}_1}$

Wherein

In other embodiments of the present utility model: the number of outside low pressure electrode can also is that one, three or other number；Can also be insulated by insulating cement between second metal level and the 3rd metal level；Inner side low-field electrode, outside low pressure electrode can also is that the tubular construction being coaxially set with corresponding insulating medium layer, and the most each low-field electrode is axially spaced apart.

Claims (4)

1. a gas-insulated stagewise current/voltage combination voltage transformer, including upper end cylinder and all pressures shielding cylinder of being connected with upper end cylinder, upper end cylinder is provided with current transformer, the inner coaxial line all pressing shielding cylinder is provided with interior insulating medium layer and external insulation dielectric layer, it is characterized in that: the outer surface of external insulation dielectric layer has been sticked the first metal layer, the inner surface of external insulation dielectric layer has been sticked the second metal level, the outer surface of interior insulating medium layer is sticked the 3rd metal level being positioned at inside the second metal level, the inner surface of interior insulating medium layer has been sticked the 4th metal level, second metal level includes at least one outside low pressure electrode, 3rd metal level includes and outside low pressure number of poles inner side low-field electrode one to one, inner side low-field electrode and corresponding outside low pressure electrode short circuit.

Gas-insulated stagewise current/voltage combination voltage transformer the most according to claim 1, it is characterised in that: the gap between the second metal level and the 3rd metal level is filled with insulating gas.

Gas-insulated stagewise current/voltage combination voltage transformer the most according to claim 1, it is characterized in that: the outside of the first metal layer has been coaxially set floating potential cylinder, all there is between pressure shielding cylinder and floating potential cylinder the gap filled for insulating gas.

4. according to the gas-insulated stagewise current/voltage combination voltage transformer described in claim 1 ~ 3 any one, it is characterized in that: outside low pressure electrode has at least two, outside low pressure electrode is the tile structure being coaxially set with external insulation dielectric layer, inner side low-field electrode is the tile structure being coaxially set with interior insulating medium layer, each outside low pressure electrode being provided at circumferentially spaced along external insulation dielectric layer, the gap between adjacent inboard low-field electrode is the most corresponding along the gap between the radial direction and corresponding adjacent outer low-field electrode of interior insulating medium layer.